"Dusk Maiden of Amnesia" is my favourite among school romance comedy.

The story is about discovering the dark past of the main heroine, who also happens to be a ghost. Every episode shows a tiny piece of the puzzle at a time, foreshadowing the plot.

The mystery is interesting enough for the genre. The final explanation is complete and consistent. It features tragic past events.

The comedy is secondary in the show. Sometimes it's goofy and adorable.

The animation and music are stylish. Makes for enjoyable spectacle.

The main hero is just a school boy. There are no other male characters. Hence the show is probably of little interest to women.

I recommend "Dusk Maiden of Amnesia" for it's mystery and beautiful main heroine, who is the entire focus.